tree-wide: no need to pass excess flags to open()/openat() if O_PATH is passed

As described in the documentation:

When O_PATH is specified in flags, flag bits other than O_CLOEXEC,
O_DIRECTORY, and O_NOFOLLOW are ignored.

So, we can remove unnecessary flags in a case when O_PATH is passed
to the open() or openat().

src/tmpfiles/tmpfiles.c

@@ -613,7 +613,7 @@ static int path_set_perms(Item *i, const char *path) {
          * with AT_SYMLINK_NOFOLLOW, hence we emulate it here via
          * O_PATH. */
 
-        fd = open(path, O_RDONLY|O_NOFOLLOW|O_CLOEXEC|O_PATH|O_NOATIME);
+        fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH);
         if (fd < 0)
                 return log_error_errno(errno, "Adjusting owner and mode for %s failed: %m", path);
 
@@ -804,7 +804,7 @@ static int path_set_acls(Item *item, const char *path) {
         assert(item);
         assert(path);
 
-        fd = open(path, O_RDONLY|O_NOFOLLOW|O_CLOEXEC|O_PATH|O_NOATIME);
+        fd = open(path, O_NOFOLLOW|O_CLOEXEC|O_PATH);
         if (fd < 0)
                 return log_error_errno(errno, "Adjusting ACL of %s failed: %m", path);